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Fourth Wave of the U.S. Overdose Crisis
U.S. opioid crisis began in the early 2000s. The current fourth wave involves fentanyl overdoses with stimulants.
Resources:
https://www.eurekalert.org/news-releases/1001209
https://onlinelibrary.wiley.com/doi/10.1111/add.16318
https://www.cdc.gov/stopoverdose/fentanyl/pdf/fentanyl_fact_sheet_508c.pdf